Display panel, display module and display device

Abstract

The application discloses a display panel, a display module and a display device, and belongs to the technical field of display. The display panel provided by the application comprises a driving back plate, a pixel definition layer, a plurality of light adjusting units and a plurality of light emitting devices. At least part of the plurality of light adjusting units is distributed in a first display area, and the plurality of light adjusting units in the first display area are configured to adjust the light transmittance of the first display area. In the case that the brightness of external ambient light is small, the light adjusting unit can improve the light transmittance of the first display area by improving the light transmittance of itself, so that the light sensing element such as an under-screen camera can have sufficient light quantity in a low-brightness environment, and the imaging quality is guaranteed to be excellent. In the case that the brightness of external ambient light is large, the light adjusting unit can reduce the light transmittance of the first display area by reducing the light transmittance of itself, so as to reduce the reflectivity of the first display area, improve the contrast of the display panel, and improve the display effect.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display panel, display module and display device. Background Technology

[0002] Display panels that use organic light-emitting diodes (OLEDs) to achieve display functions are called OLED display panels. Compared with traditional liquid crystal displays (LCDs), they have the advantages of self-illumination, thinness, high contrast, wide viewing angle, and vibrant colors. In addition, OLED devices are much thinner than LCDs, and can be made into various shapes such as bent, curved, and rolled, breaking through the traditional form of screens and being widely used in wearable devices.

[0003] To achieve a truly full-screen display and minimize the visual unsightly irregular openings caused by under-display cameras and other factors, current mobile terminal devices typically place the photosensitive element under the display panel for functions such as camera recording. To ensure sufficient light intake for the photosensitive element, the light transmittance of the display panel needs to be increased. Summary of the Invention

[0004] This application provides a display panel, a display module, and a display device. It solves the problem of low light transmittance in existing display panels. The technical solution is as follows: On one hand, a display panel is provided, characterized in that the display area of ​​the display panel includes: a first display area and a second display area, wherein the second display area is at least partially distributed around the first display area; the display panel includes: a driving backplane, a pixel definition layer, a plurality of dimming units and a plurality of light-emitting devices; The plurality of dimming units are located on one side of the driving backplate, and at least some of the dimming units are distributed within the first display area; The pixel definition layer is located on the side of the plurality of dimming units away from the driving backplate. The pixel definition layer covers each of the dimming units and has a plurality of pixel openings. A portion of the plurality of pixel openings are located in the first display area, and another portion of the pixel openings are located in the second display area. The plurality of light-emitting devices correspond to the plurality of pixel openings, and the light-emitting devices are located within the corresponding pixel openings. The plurality of light-emitting devices are electrically connected to the driving backplate. The plurality of dimming units within the first display area are configured to adjust the light transmittance of the first display area.

[0005] Optionally, the dimming unit includes: a first electrode and a second electrode, and an electrochromic portion distributed between the first electrode and the second electrode; the first electrode and the second electrode are disposed opposite to each other in a direction parallel to the drive back plate; The electrochromic part is configured to adjust the light transmittance under the action of an electric field formed between the first electrode and the second electrode.

[0006] Optionally, the display panel further includes: a first connection line and a second connection line; the first connection line is electrically connected to the first electrode of each of the dimming units, and the second connection line is electrically connected to the second electrode of each of the dimming units; Both the first and second connecting lines are used for electrical connection with the light transmission control circuit.

[0007] Optionally, the plurality of dimming units are arranged in multiple columns along the first direction and in multiple rows along the second direction; The first connection line includes: multiple first signal connection lines and at least one second signal connection line; the first electrode of the dimming unit in the same row is electrically connected to the same first signal connection line, and the multiple first signal connection lines are all electrically connected to the light transmission control circuit through the at least one second signal connection line; The second connection line includes: multiple third signal connection lines and at least one fourth signal connection line; the second electrode of the dimming unit in the same row is electrically connected to the same third signal connection line, and the multiple third signal connection lines are all electrically connected to the light transmission control circuit through the at least one fourth signal connection line.

[0008] Optionally, the electrochromic part is elongated, and in the same dimming unit, one end of the electrochromic part is electrically connected to the first electrode in the length direction, and the other end is electrically connected to the second electrode.

[0009] Optionally, the material of the electrochromic part includes: viologen compounds, polyaniline, tungsten trioxide, niobium oxide, or poly3,4-ethylenedioxythiophene.

[0010] Optionally, the driving backplane includes: a substrate and a plurality of pixel driving circuits, wherein the plurality of pixel driving circuits are electrically connected to the plurality of light-emitting devices respectively; In this configuration, all of the plurality of pixel driving circuits are located within the second display area; or, a portion of the plurality of pixel driving circuits are located within the second display area, while another portion of the pixel driving circuits are located within the first display area.

[0011] Optionally, the driving backplane includes a substrate and a driving circuit layer, the driving circuit layer including the plurality of pixel driving circuits; when a portion of the plurality of pixel driving circuits is located in the second display area and another portion of the pixel driving circuits is located in the first display area, at least the portion of the source-drain layer in the driving circuit layer located in the first display area is made of a transparent conductive material.

[0012] Optionally, the portion of the source-drain layer located within the first display area includes: a first type of signal line and a second type of signal line; The first type of signal line is completely covered by the pixel definition layer; or, the orthographic projection of the first type of signal line on the substrate includes a first region and a second region, the first region is located within the orthographic projection of the pixel definition layer on the substrate, the second region is located within the orthographic projection of the pixel opening on the substrate, and the area of ​​the first region is larger than the area of ​​the second region. The orthographic projection of the second type of signal line on the substrate includes a third region and a fourth region. The third region is located within the orthographic projection of the pixel definition layer on the substrate, and the fourth region is located within the orthographic projection of the pixel opening on the substrate. The area of ​​the third region is smaller than the area of ​​the fourth region. The first type of signal line is made of the transparent conductive material.

[0013] Optionally, the first type of signal line includes: a data signal line and a first bridging wire, wherein the first bridging wire is used to bridge the initial signal line in the driving circuit layer with the polysilicon layer in the driving circuit layer.

[0014] Optionally, the portions of the source / drain layers located in the first display area and the portions located in the second display area are made of the same material, both being made of the transparent conductive material.

[0015] Optionally, the transparent conductive material includes silver nanowires, indium tin oxide, or indium zinc oxide.

[0016] Optionally, the orthographic projection of the dimming unit on the driving back panel and the orthographic projection of the light-emitting device on the driving back panel do not overlap; in a direction parallel to the driving back panel, the dimming unit and the light-emitting device located in the first display area are arranged alternately.

[0017] On the other hand, a display module is provided, characterized in that it includes: a driving component and a display panel electrically connected to the driving component, wherein the display panel is any of the display panels described above.

[0018] In another aspect, a display device is provided, characterized in that it includes: a photosensitive element and the display module described above; the light-receiving surface of the photosensitive element faces the first display area of ​​the display panel in the display module.

[0019] Optionally, the driving component in the display module integrates a light transmission control circuit, which is electrically connected to a plurality of dimming units distributed in the first display area. The display device further includes a light sensor; the display device is configured to: acquire the light intensity of ambient light through the light sensor, and control the light transmittance of the plurality of dimming units based on the light intensity of the ambient light through the light transmittance control circuit; The light intensity of the ambient light is negatively correlated with the light transmittance of the dimming unit.

[0020] The beneficial effects of the technical solutions provided in this application include at least the following: Since multiple dimming units within the first display area are configured to adjust the light transmittance of the first display area, when the ambient light is low, the dimming units can increase their own light transmittance to improve the light transmittance of the first display area. This ensures that the under-display camera and other photosensitive elements have sufficient light intake in low-light environments, guaranteeing excellent image quality. When the ambient light is high, the dimming units can decrease their own light transmittance to decrease the light transmittance of the first display area, thereby reducing the reflectivity of the first display area, improving the contrast of the display panel, and enhancing the display effect. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a top view of a display panel provided in an embodiment of this application; Figure 2 This is a partial structural diagram of a display panel provided in an embodiment of this application; Figure 3 This is a schematic diagram of the optical path at a dimming unit provided in an embodiment of this application; Figure 4 This is a schematic diagram of the optical path at another dimming unit provided in an embodiment of this application; Figure 5 This is a schematic diagram of the control loop of a dimming unit provided in an embodiment of this application; Figure 6 This is a partial structural schematic diagram of another display panel provided in an embodiment of this application; Figure 7 This is a partial top view of a display panel provided in an embodiment of this application; Figure 8 This is a partial circuit diagram of the drive backplane provided in the embodiments of this application; Figure 9 This is a partial top view of another display panel provided in an embodiment of this application; Figure 10 This is a partial structural schematic diagram of a display device provided in an embodiment of this application. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0024] Please refer to Figure 1 , Figure 1 This is a top view of a display panel provided in an embodiment of this application. The display panel 000 may have a display area 001 and a non-display area 002. The display area 001 may include a first display area 011 and a second display area 021, with the second display area 021 at least partially distributed around the first display area 011. For example, as shown... Figure 1 As shown, the second display area 021 is distributed around the first display area 011. The light-receiving surface of the photosensitive element in the display device can face the first display area 011.

[0025] In related technologies, the low light transmittance of the display panel itself limits the amount of light entering the under-display photosensitive element, significantly affecting image quality. To address this, the pixel density (Pixels Per Inch, PPI) of the first display area 011 can be reduced to increase the area of ​​the light-transmitting region between pixels, thus meeting the light intake requirements of the under-display photosensitive element. However, this solution reduces the pixel density of the first display area 011, which can easily lead to problems such as coarse image quality and short lifespan in the first display area 011, and a significant difference in display performance between the first display area 011 and the second display area 021. Furthermore, while using transparent circuit design and pixel arrangement optimization helps maintain consistency in display performance between the first display area 011 and the second display area 021, it may still result in insufficient light intake in low-light environments. In strong light environments, the display effect is easily and significantly affected because the display panel also has a high reflectivity to ambient light.

[0026] To address the challenge of synergistically optimizing conflicting performance parameters such as transmittance, pixel density, and ambient light reflectance in display devices containing under-display cameras and other photosensitive elements, and to avoid performance incompatibility resulting from the trade-off between these parameters, this application provides a display panel that, while ensuring a high pixel density in the display area, achieves sufficient light intake in the area where the under-display camera and other photosensitive elements are located under different ambient light intensities, while also exhibiting high contrast and excellent contrast display results. This achieves optimized compatibility between screen display quality and camera imaging quality.

[0027] Please refer to Figure 2 , Figure 2 This is a partial structural diagram of a display panel provided in an embodiment of this application. The display panel 000 may include: a driving backplate 100, a pixel definition layer 200, multiple dimming units 300, and multiple light-emitting devices 400.

[0028] The multiple dimming units 300 in the display panel 000 are located on one side of the drive back plate 100, and at least some of the dimming units 300 are distributed in the first display area 011.

[0029] The pixel definition layer 200 in the display panel 000 is located on the side of the multiple dimming units 300 away from the driving backplate 100. The pixel definition layer 200 covers each dimming unit 300 and has multiple pixel openings K. A portion of the multiple pixel openings K are located in the first display area 011, and another portion of the pixel openings K are located in the second display area 021.

[0030] The multiple light-emitting devices 400 in the display panel 000 correspond to multiple pixel openings K, and the light-emitting devices 400 are located in the corresponding pixel openings K. The multiple light-emitting devices 400 can be electrically connected to the driving backplate 100.

[0031] Among them, the multiple dimming units 300 in the first display area 011 are configured to adjust the light transmittance of the first display area 011.

[0032] It should be noted that, in this embodiment, the pixel density in the first display area 011 can be equal to the pixel density in the second display area 021; or, the pixel density in the first display area 011 can be less than the pixel density in the second display area 021, and the difference is small. This ensures that the display effect of the first display area 011 and the second display area 021 will not differ significantly, resulting in a better overall display effect for the display panel 000 and avoiding problems such as coarse image quality and short area lifespan caused by excessively low pixel density in the first display area 011.

[0033] And please refer to Figure 3 , Figure 3This is a schematic diagram of the optical path at a dimming unit provided in an embodiment of this application. When the ambient light is low, the multiple dimming units 300 within the first display area 011 can increase the light transmittance of the first display area 011 by increasing their own light transmittance. Simultaneously, it is understood that since the pixel definition layer 200 covers the dimming units 300, in the stacking direction of the driving backplate 100 and the pixel definition layer 200, compared to the case without dimming units 300, the thickness of the portion of the pixel definition layer 200 located on the side of the dimming units 300 away from the driving backplate 100 can be smaller, and the light transmittance of the pixel definition layer 200 can also be improved to a certain extent. Thus, even if the pixel density of the first display area 011 is still high, the dimming units 300 with higher light transmittance and the thinner pixel definition layer 200 can still improve the overall light transmittance of the first display area 011 to a certain extent, thereby ensuring that photosensitive elements such as the under-display camera have sufficient light intake in low-light environments, guaranteeing excellent image quality.

[0034] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the optical path at another dimming unit provided in an embodiment of this application. When the ambient light is bright, the multiple dimming units 300 in the first display area 011 can reduce the transmittance of the first display area 011 by reducing their own transmittance. This prevents excessive ambient light from being reflected by reflective structures such as the metal layer in the driving backplate 100 after passing through the pixel definition layer 200 and the dimming unit 300, thereby reducing the reflectivity of the first display area 011 and improving the contrast of the display panel 000.

[0035] Therefore, the display panel 000 provided in this application embodiment can dynamically adjust the transmittance of the dimming unit 300 to optimize the transmittance and reflectance of the first display area 011 of the display panel 000, ensuring that the pixel density of the first display area 011 and the second display area 021 is equal or has a small difference, that is, that the display quality of the first display area 011 and the display quality of the second display area 021 are not significantly different. This allows the display panel 000 to ensure that the under-screen photosensitive element has sufficient light intake and that the contrast ratio is high under different ambient light intensities, resulting in a better display effect for the display panel 000.

[0036] In summary, the display panel provided in this application includes: a driving backplane, a pixel definition layer, multiple dimming units, and multiple light-emitting devices. At least some of the multiple dimming units are distributed within a first display area, and the multiple dimming units within the first display area are configured to adjust the transmittance of the first display area. When the ambient light is low, the dimming units can increase their own transmittance to improve the transmittance of the first display area, thereby ensuring sufficient light intake for photosensitive elements such as the under-display camera in low-light environments, guaranteeing excellent image quality. When the ambient light is high, the dimming units can decrease their own transmittance to reduce the transmittance of the first display area, thereby reducing the reflectivity of the first display area, improving the contrast of the display panel, and enhancing the display effect.

[0037] Please refer to Figure 5 , Figure 5 This is a schematic diagram of the control loop of a dimming unit provided in an embodiment of this application. The dimming unit 300 in the display panel 000 may include: a first electrode 301 and a second electrode 302, and an electrochromic part 303 distributed between the first electrode 301 and the second electrode 302. The first electrode 301 and the second electrode 302 are arranged opposite to each other in a direction parallel to the drive back plate 100.

[0038] Here, the electrochromic unit 303 is configured to adjust the light transmittance under the influence of an electric field formed between the first electrode 301 and the second electrode 302. In this way, the electrochromic unit 303 can increase the light transmittance, thereby increasing the light transmittance of the display area where the dimming unit 300 is located. This ensures that the under-display camera and other photosensitive elements have sufficient light intake when the ambient light is low, guaranteeing excellent image quality. Alternatively, the electrochromic unit 303 can decrease the light transmittance, thereby decreasing the light transmittance of the display area where the dimming unit 300 is located. In cases of high ambient light, this prevents excessive ambient light from being reflected by reflective structures such as the metal layer in the drive backplate 100 after passing through the pixel definition layer 200 and the dimming unit 300, thus reducing the reflectivity of the display panel 000, increasing the contrast of the display panel 000, and improving the display effect.

[0039] The display panel 000 may further include a first connection line 510 and a second connection line 520. The first connection line 510 can be electrically connected to the first electrode 301 of each dimming unit 300, and the second connection line 520 can be electrically connected to the second electrode 302 of each dimming unit 300. Here, both the first connection line 510 and the second connection line 520 are used to be electrically connected to a light transmission control circuit. The light transmission control circuit can adjust the current in the circuit according to the intensity of ambient light, thereby adjusting the light transmittance of the electrochromic section 303.

[0040] It should be noted that, in this embodiment, the light transmission control circuit can be integrated within the drive backplane 100. Alternatively, the light transmission control circuit can be placed outside the display panel 000. For example, the light transmission control circuit can be integrated into a flexible printed circuit (FPC) or printed circuit board (PCB) electrically connected to the display panel 000.

[0041] Since the pixel driving circuits P of the multiple light-emitting devices 400 in the display panel 000 are usually located within the driving backplate 100, if the light transmission control circuit is also integrated within the driving backplate 100, the wiring positions of the pixel driving circuits P and each signal trace need to be replanned to ensure sufficient wiring space. Alternatively, a conductive layer could be added within the driving backplate 100 for wiring, which would significantly increase the production cost of the display panel 000. Furthermore, considering that the area of ​​the first display area 011 is usually smaller than that of the second display area 021, resulting in less wiring space, it is more beneficial to place the light transmission control circuit, which is electrically connected to the dimming unit 300 used to adjust the light transmittance of the first display area 011, separately outside the display panel 000, which is more conducive to reducing the production cost of the display panel 000.

[0042] like Figure 5 As shown, multiple dimming units 300 can be arranged in multiple columns along the first direction X and in multiple rows along the second direction Y. Here, both the first direction X and the second direction Y are parallel to the display surface of the display panel 000, and the first direction X intersects the second direction Y. For example, the first direction X and the second direction Y can be perpendicular to each other.

[0043] The first connection line 510 may include multiple first signal connection lines 511 and at least one second signal connection line 512. The first electrode 301 of the dimming unit 300 in the same row is electrically connected to the same first signal connection line 511, and the multiple first signal connection lines 511 are all electrically connected to the light transmission control circuit through at least one second signal connection line 512.

[0044] The second connection line 520 may include multiple third signal connection lines 521 and at least one fourth signal connection line 522. The second electrode 302 of the dimming unit 300 in the same row is electrically connected to the same third signal connection line 521, and the multiple third signal connection lines 521 are all electrically connected to the light transmission control circuit through at least one fourth signal connection line 522.

[0045] In this way, multiple dimming units 300 can be connected in parallel and electrically connected to the same light transmission control circuit. The light transmittance of the multiple dimming units 300 connected in parallel can be adjusted uniformly, and the circuit setup is relatively simple. In the first connection line 510 and the second connection line 520 that are electrically connected to the multiple dimming units 300 in the first display area 011, the number of signal connection lines is small, and the width of the signal connection lines is small in the direction parallel to the drive backplate 100 and perpendicular to the extension direction of the signal connection lines. Therefore, this arrangement of the connection lines can ensure that the signal connection lines have a small impact on the light transmittance of the display panel 000.

[0046] In this embodiment, the electrochromic part 303 may be elongated. Within the same dimming unit 300, one end of the electrochromic part 303 is electrically connected to the first electrode 301 along its length, and the other end is electrically connected to the second electrode 302. For example, as shown... Figure 5 As shown, the electrochromic portion 303 can extend along the second direction Y, that is, the length of the electrochromic portion 303 in the second direction Y is greater than or equal to the length of the electrochromic portion 303 in the first direction X. The first electrode 301 and the second electrode 302 are distributed on opposite sides of the electrochromic portion 303 in the second direction Y. In this way, the area of ​​the orthographic projection of the first electrode 301 and the second electrode 302 on the driving back plate 100 can be smaller, thereby minimizing the influence of the first electrode 301 and the second electrode 302 on the light transmittance.

[0047] Here, the electrochromic part 303 can be formed by magnetron sputtering, and the pixel definition layer 200 can be formed by inkjet printing or etching.

[0048] Depending on the material properties, the electrochromic part 303 can be made of viologen compounds, polyaniline, tungsten trioxide, niobium oxide, or poly(3,4-ethylenedioxythiophene). By controlling the electronic structure of the material (redox state or doped state), its light absorption and transmission behavior can be precisely controlled, thereby achieving reversible or directional control of optical properties.

[0049] Viologen compounds can achieve high transmittance in their reduced state (e.g., divalent cations), while their oxidized state enhances absorption of visible light and reduces transmittance. The conductivity and optical properties of polyaniline materials are modulated through doping; protonic acid doping causes a red shift in absorption peaks, increasing transmittance from 60% to 85%. Ion-intercalated materials, such as tungsten trioxide (WO3)-based materials, form tungsten bronze (e.g., LiWO3) upon Li+ insertion. This material exhibits a blue shift in absorption band, increasing visible light transmittance from 30% to 80%. Depending on the insertion concentration, transmittance can be dynamically adjusted between 30% and 80%. Furthermore, the driving voltage for this material is between 1 and 3 V, with a rapid response time of less than 1 second.

[0050] It should be noted that the dimming unit 300 may also include any other color-changing material with dynamically adjustable transmittance. This application does not impose any restrictions on this; the embodiments of this application only use electrochromic materials as an example for illustrative purposes. Electrochromic materials refer to the phenomenon that the optical properties (reflectivity, transmittance, absorptivity, etc.) of a material undergo stable and reversible color changes under the action of an external electric field. In appearance, this manifests as reversible changes in color and transparency. Materials with electrochromic properties are called electrochromic materials.

[0051] like Figure 6 As shown, Figure 6 This is a partial structural schematic diagram of another display panel provided in an embodiment of this application. The driving backplane 100 may include: a substrate 101 and multiple pixel driving circuits P, wherein the multiple pixel driving circuits P are electrically connected to multiple light-emitting devices 400 respectively. For example, Figure 7 As shown, Figure 7 This is a partial top view of a display panel structure provided in an embodiment of this application. Multiple pixel driving circuits P can all be located within the second display area 021. Thus, the light-emitting device 400 in the first display area 011 and the corresponding pixel driving circuit P can be electrically connected via a conductive line L. That is, one end of the conductive line L can be electrically connected to the output terminal of the pixel driving circuit P located in the second display area 021, and the other end of the conductive line L can be electrically connected to the anode 401 of the light-emitting device 400 located in the first display area 011. Therefore, the conductive line L is at least partially located within the first display area 011. Here, the conductive line L can include a high-transmittance conductive material, such as indium zinc oxide (IZO), indium tin oxide (ITO), or silver nanowires.

[0052] In this way, when the ambient light is low, the high-transmittance conductive line L can work with the high-transmittance dimming unit 300 to further increase the amount of light entering the under-display camera and other photosensitive elements, ensuring excellent image quality. At the same time, when the ambient light is high, even if the transmittance of the conductive line L is high, the transmittance of the dimming unit 300 can be reduced to prevent excessive ambient light from being reflected by reflective structures such as the metal layer in the drive backplate 100 after passing through the pixel definition layer 200, the dimming unit 300 and the conductive line L. This reduces the reflectivity of the display panel 000, increases the contrast of the display panel 000, and improves the display effect.

[0053] Alternatively, some of the pixel driving circuits P can be located within the second display area 021, while other pixel driving circuits P can be located within the first display area 011. This simplifies the wiring in the driving backplane 100. For example... Figure 6As shown, the driving backplane 100 includes a substrate 101 and a driving circuit layer 102, which includes the aforementioned plurality of pixel driving circuits P. The driving circuit layer 102 may include: a buffer layer 1021, a polysilicon layer 1022, a first gate insulating layer 1023, a first gate layer 1024, a second gate insulating layer 1025, a second gate layer 1026, an interlayer dielectric isolation layer 1027, a source-drain layer 1028, and a planarization layer 1029, stacked along a direction away from the substrate 101. The source-drain layer 1028 and the planarization layer 1029 are both at least one layer.

[0054] In a scenario where a portion of the pixel driving circuits P are located within the second display area 021 and another portion are located within the first display area 011, at least a portion of the source / drain layer 1028 within the driving circuit layer 102 located within the first display area 011 is made of a transparent conductive material. This allows the high-transmittance source / drain layer 1028, in conjunction with the high-transmittance dimming unit 300, to further increase the light intake of under-display camera and other photosensitive elements, ensuring excellent image quality, even when the ambient light is high. Conversely, even with high transmittance in some of the source / drain layers 1028, the transmittance of the dimming unit 300 can be reduced to prevent excessive ambient light from being reflected by other reflective structures in the driving backplate 100 after passing through the pixel definition layer 200, dimming unit 300, and the high-transmittance source / drain layer 1028. This reduces the reflectivity of the display panel 000, increases its contrast, and improves the display effect.

[0055] In related technologies, both the first gate layer 1024 and the source / drain layer 1028 in the driving circuit layer 102 can be film structures made of inorganic metal materials. For example, the material of the first gate layer 1024 may include molybdenum, and the material of the source / drain layer 1028 may include titanium and aluminum. Therefore, the first gate layer 1024 and the source / drain layer 1028 have low light transmittance and high reflectivity. Furthermore, in the direction perpendicular to the substrate 101, that is, in the stacking direction of the substrate 101 and the driving circuit layer 102, the thickness of the first gate layer 1024 is approximately 250 nanometers, and the thickness of the source / drain layer 1028 is approximately 700 nanometers. It can be seen that the thickness of the source / drain layer 1028 is approximately three times that of the first gate layer 1024.

[0056] Please refer to Figure 8 and Figure 9 , Figure 8 This is a partial circuit diagram of the drive backplane provided in an embodiment of this application. Figure 9This is a partial top view of another display panel structure provided in this application embodiment. The total area of ​​the source / drain layer 1028 projected onto the substrate 101 is approximately twice the total area of ​​the first gate layer 1024 projected onto the substrate 101. Considering the thickness of the film layers, the area of ​​the film layers projected onto the substrate 101, and related experimental tests, it is shown that the source / drain layer 1028 is the main film layer causing the low transmittance of the driving circuit layer 102 to visible light. Therefore, by configuring at least a portion of the source / drain layer 1028 within the first display area 011 of the driving circuit layer 102 as a structure made of a transparent conductive material, the transmittance of the driving circuit layer 102 to visible light can be effectively improved. This helps to save material costs.

[0057] The portion of the source-drain layer 1028 located within the first display area 011 may include: a first type of signal line 610 and a second type of signal line 620.

[0058] The first type of signal line 610 is completely covered by the pixel definition layer 200; or, the orthographic projection of the first type of signal line 610 on the substrate 101 includes a first region and a second region, the first region is located within the orthographic projection of the pixel definition layer 200 on the substrate 101, the second region is located within the orthographic projection of the pixel opening K on the substrate 101, and the area of ​​the first region is larger than the area of ​​the second region.

[0059] The orthographic projection of the second type signal line 620 on the substrate 101 includes a third region and a fourth region. The third region is located within the orthographic projection of the pixel definition layer 200 on the substrate 101, and the fourth region is located within the orthographic projection of the pixel opening K on the substrate 101. The area of ​​the third region is smaller than the area of ​​the fourth region.

[0060] Among them, the first type of signal line 610 can be a conductive structure made of transparent conductive material.

[0061] It should be noted that, as Figure 6 As shown, the light-emitting device 400 may include an anode 401, a cathode 402, and a light-emitting layer 403 located between the anode 401 and the cathode 402. To improve the light extraction efficiency of the display panel 000, the anode 401 in the light-emitting device 400 typically has a high reflectivity (above 90%) to reflect light emitted from the light-emitting layer 403 towards the anode 401, allowing more light to escape from the display surface of the display panel 000. Therefore, the anode 401 has low transmittance for visible light. Here, the orthographic projection of the pixel opening K onto the substrate 101 can be located within the orthographic projection of the anode 401 in the light-emitting device 400 onto the substrate 101.

[0062] It is understandable that when ambient light shines on the area of ​​the pixel definition layer 200 where no pixel opening K is provided, the ambient light can pass through the pixel definition layer 200 and further through the driving circuit layer 102 and the substrate 101, providing light to the photosensitive element disposed under the screen. However, when ambient light shines on the area where the pixel opening K is located, the transmittance of the ambient light at the anode 401 is almost 0. Even if the transmittance of the portion of the driving circuit layer 102 located directly below the anode 401 is increased, there is no significant gain in increasing the amount of light received by the photosensitive element under the screen. Here, the portion of the driving circuit layer 102 located directly below the anode 401 means that the orthographic projection of this portion of the driving circuit layer 102 on the substrate 101 lies within the orthographic projection of the anode 401 on the substrate 101. Therefore, by setting the first type of signal line 610 in the source-drain layer 1028 to a structure made of transparent conductive material, the transmittance of the first display area 011 to visible light can be effectively improved. This allows for a further increase in the amount of light received by the under-display camera and other photosensitive elements even when the ambient light is low, ensuring excellent image quality. This also helps to save on material costs.

[0063] Furthermore, since the pixel definition layer 200 covers the dimming unit 300, the orthographic projection of the dimming unit 300 on the substrate 101 can overlap with the orthographic projection of the first type signal line 610 on the substrate 101. Thus, even when the ambient light is high, and the first type signal line 610 has high transmittance, reducing the transmittance of the dimming unit 300 can prevent excessive ambient light from passing through the pixel definition layer 200, the dimming unit 300, and the first type signal line 610 and being reflected by other reflective structures in the drive backplate 100. This reduces the reflectivity of the display panel 000, increases the contrast of the display panel 000, and improves the display effect.

[0064] In some possible implementations, such as Figure 8 As shown, in the same pixel driving circuit P, P can have multiple signal input terminals for electrical connection to and receipt of various driving signals via multiple driving signal lines. These driving signals may include: a gate driving signal (Gate), a data signal (Vdata), an initial signal (Vinit), an emission enable signal (EM), a high-level power supply signal (VDD), and a reset signal (Reset). The pixel driving circuit P is electrically connected to the anode 401 of the light-emitting device 400, and the cathode 402 of the light-emitting device 400 is electrically connected to the low-level power supply signal line to obtain a low-level power supply signal (VSS). For example, a pixel driving circuit P may include multiple transistors T1-T7 and a storage capacitor Cst. Figure 8 and Figure 9 As shown, T1 to T7 are all transistors, and Cst is the storage capacitor. Figure 6As shown, the transistor may include: an active layer Act, a gate G, a source S, and a drain D. The active layer Act is insulated from the gate G through a first gate insulating layer 1023. Both the source S and the drain D can be connected to the active layer Act. Here, the pixel driving circuit P can be electrically connected to multiple driving signal lines of the same type, such as light emission control signal lines. Figure 8 In the diagram, the pixel driving circuit P can be connected to both the light-emitting enable signal EM1 and the light-emitting enable signal EM2, which are distinguished by the labels "1" and "2". For example... Figure 9 As shown, the light emission control signal line EM can be located in the first gate layer 1024, and the first gate layer 1024 can also include: a gate signal line Gate and a reset signal line Reset.

[0065] like Figure 9 As shown, the first type of signal line 610 may include a data signal line Vdata and a first bridging line B1. The first bridging line B1 is used to bridge the initial signal line Vinit in the driving circuit layer 102 with the polysilicon layer 1022 in the driving circuit layer 102. The initial signal line Vinit may be located in the second gate layer 1026.

[0066] In this embodiment, the second type of signal line 620 may include: a high-level power supply signal line VDD, a second bridge line B2, and a third bridge line B3. The second bridge line B2 can be used to bridge the second gate layer 1026 in the driving circuit layer 102 with the polysilicon layer 1022 in the driving circuit layer 102. The third bridge line B3 can be the drain D of the sixth transistor T6. It should be noted that when the driving circuit layer 102 of the display panel 000 includes a source-drain layer 1028, combined with... Figure 6 and Figure 9 The third bridge wire B3 can be electrically connected to the active layer Act of the sixth transistor T6 through the first adapter hole V1, and to the anode 401 of the light-emitting device 400 through the second adapter hole V2, thereby realizing the electrical connection between the anode 401 and the pixel driving circuit P. Alternatively, if the driving circuit layer 102 of the display panel 000 includes multiple source-drain layers 1028, the third bridge wire B3 can be electrically connected to the active layer Act of the sixth transistor T6 through the first adapter hole V1, and to the adapter electrodes (not shown in the figure) in other source-drain layers through the second adapter hole V2. In this way, the anode 401 of the light-emitting device 400 can be electrically connected to the pixel driving circuit P by connecting to the adapter electrodes.

[0067] It should be noted that the source / drain layer 1028 may also include a portion located outside the first display area 011. In some other embodiments, the portions of the source / drain layer 1028 located within the first display area 011 and the portions located within the second display area 021 may be made of the same material, both being made of a transparent conductive material. If the source / drain layer 1028 also includes a portion located within the non-display area 002, the portion of the source / drain layer 1028 located within the non-display area 002 may also be made of the same material as the portion located within the display area 001, both being made of a transparent conductive material. Thus, the entire source / drain layer 1028 can be a film layer made of the same material. Therefore, a single patterning process can be used to set the same layer with the same material, thereby ensuring the continuity and feasibility of the process steps and ensuring a relatively simple fabrication process for the display panel 000. Here, the single patterning process may include: photoresist coating, exposure processing, development processing, etching processing, and photoresist stripping.

[0068] Transparent conductive materials may include silver nanowires, indium tin oxide, or indium zinc oxide. This is merely illustrative; at least a portion of the source / drain layer 1028 may also be a film layer made of other transparent conductive materials, and this application makes no limitation in this regard. For example, at least a portion of the source / drain layer 1028 located within the first display area 011 may be a structure made of silver nanowires. Silver nanowires possess both high conductivity and excellent flexibility, and their light transmittance can be greater than or equal to 90%.

[0069] In the embodiments of this application, such as Figure 2 and Figure 5 As shown, the orthographic projection of the dimming unit 300 on the driving backplate 100 does not overlap with the orthographic projection of the light-emitting device 400 on the driving backplate 100, so as to avoid the dimming unit 300 affecting the light emission of the light-emitting device 400 while adjusting the light transmittance, thereby avoiding affecting the display effect of the display panel 000. In the direction parallel to the driving backplate 100, the dimming unit 300 located in the first display area 011 can be arranged alternately with the light-emitting device 400.

[0070] In this embodiment, the pixel density of the first display area 011 can be less than or equal to the pixel density of the second display area 021. That is, the distribution density of the light-emitting devices 400 distributed in the first display area 011 is less than or equal to the distribution density of the light-emitting devices 400 distributed in the second display area 021. When the pixel density of the first display area 011 is equal to the pixel density of the second display area 021, there is no significant difference in the display quality between the first display area 011 and the second display area 021. This ensures a good overall display effect for the display panel 000 and avoids problems such as coarse display quality and short area lifespan caused by excessively low pixel density in the first display area 011.

[0071] like Figure 2 As shown, the display panel 000 may further include an encapsulation layer 700, located on the side of the light-emitting device 400 facing away from the driving backplate 100. The encapsulation layer 700 may include a first inorganic encapsulation layer 701, an organic encapsulation layer 702, and a second inorganic encapsulation layer 703 stacked together, with the first inorganic encapsulation layer 701 closer to the driving backplate 100 than the second inorganic encapsulation layer 703. The first inorganic encapsulation layer 701 can cover each light-emitting device 400, ensuring a good encapsulation effect for the display panel 000. The organic encapsulation layer 702 can ensure good flatness of the display panel 000, thus ensuring good performance of other functional layers subsequently formed on the encapsulation layer 700. The second inorganic encapsulation layer 703 can cover the side of the organic encapsulation layer 702 facing away from the substrate 101, preventing water and oxygen from entering the organic encapsulation layer 702 on the display side of the display panel 000, which could lead to encapsulation failure. By providing an encapsulation layer 700 in the display panel 000, water and oxygen from the external environment can be prevented from corroding the light-emitting device 400 from the display side of the display panel 000, thereby improving the reliability of the display panel 000.

[0072] It should be noted that the display panel provided in this application can be an OLED display panel, or it can be a QLED display panel that uses quantum dot light-emitting diodes (QLED) to achieve the display function, or it can be a QD-OLED display panel that uses quantum dot organic light-emitting diodes (QD-OLED) to achieve the display function. This application does not impose any limitations on this.

[0073] In summary, the display panel provided in this application includes: a driving backplane, a pixel definition layer, multiple dimming units, and multiple light-emitting devices. At least some of the multiple dimming units are distributed within a first display area, and the multiple dimming units within the first display area are configured to adjust the transmittance of the first display area. When the ambient light is low, the dimming units can increase their own transmittance to improve the transmittance of the first display area, thereby ensuring sufficient light intake for photosensitive elements such as the under-display camera in low-light environments, guaranteeing excellent image quality. When the ambient light is high, the dimming units can decrease their own transmittance to reduce the transmittance of the first display area, thereby reducing the reflectivity of the first display area, improving the contrast of the display panel, and enhancing the display effect.

[0074] This application also provides a display module, which may include: a driving component and a display panel 000 electrically connected to the driving component, wherein the display panel 000 may be any of the display panels 000 described above. The driving component may include: a driving chip and a flexible circuit board. Alternatively, the driving component may include: a driving chip and a printed circuit board. A light transmission control circuit electrically connected to the dimming unit 300 may be integrated into the driving component.

[0075] like Figure 5 As shown, the light transmission control circuit may include: a power supply E, a switching element, and a microcontroller arranged in series. In this embodiment, the switching element may be a metal-oxide-semiconductor field-effect transistor (MOSFET), which uses the electric field generated by the gate voltage G to control the conduction and turn-off of carriers in the semiconductor channel, thereby realizing the path control of the current between the source S and the drain D.

[0076] The microcontroller is electrically connected to the gate G of the switching element, and the positive terminal of the power supply is electrically connected to the source S of the switching element. The two electrodes in the dimming unit 300 can be electrically connected to the drain D of the switching element and the negative terminal of the power supply E, respectively. For example, the first electrode 301 of the dimming unit 300 can be electrically connected to the negative terminal of the power supply E, and the second electrode 302 of the dimming unit 300 can be electrically connected to the drain D of the switching element.

[0077] It should be noted that the light transmission control circuit may also include protective components such as a current-limiting resistor R and a voltage-stabilizing capacitor C. For example... Figure 5 As shown, the current-limiting resistor R can be connected in series with the dimming unit 300. For example, one end of the current-limiting resistor R is electrically connected to the positive terminal of the power supply E, and the other end of the current-limiting resistor R is electrically connected to the source S of the switching element. This is used to prevent excessive current in the light transmission control circuit from damaging the circuit components. The voltage-stabilizing capacitor C can be connected in parallel with the power supply E to stabilize the voltage across the dimming unit 300, preventing voltage instability from causing multiple changes in the light transmittance of the electrochromic part 303 in a short period of time, resulting in screen flicker and affecting the display effect of the display panel 000. Depending on the specific function, the light transmission control circuit may also include other functional components for current detection, temperature protection, etc. This application does not impose any limitations on this.

[0078] The microcontroller is configured to acquire the light intensity signal of ambient light and adjust the current in the light transmission control circuit based on the signal, thereby adjusting the light transmittance of the electrochromic part 303 in the dimming unit 300. Here, the light intensity of ambient light is negatively correlated with the light transmittance of the dimming unit 300.

[0079] For example, when the ambient light intensity is greater than or equal to 1000 nits, the light transmittance of the dimming unit 300 can be less than or equal to 30%. When the ambient light intensity is less than or equal to 10 nits, the light transmittance of the dimming unit 300 can be greater than or equal to 80%.

[0080] Taking into account factors such as the controllable range of light transmittance, specific response time, and material preparation process, this application embodiment uses an electrochromic part 303 comprising tungsten trioxide material with Li ion intercalation (the light transmittance can be dynamically adjusted between 30% and 80%) and a first type of signal line 610 in the source / drain layer 1028 comprising silver nanowire material as an example. Numerical calculations are performed on the optimization effect of the dimming unit 300 on the light transmittance and reflectance of the first display area 011 in the display panel 000 under ambient light conditions of different brightness: Prerequisites: It should be noted that this application does not impose any restrictions on the arrangement of the light-emitting devices 400. Under different arrangement methods, the aperture ratio of the display panel 000 fluctuates between 12% and 30%. The embodiments of this application are calculated based on an aperture ratio A1 = 20%. In addition, in the direction parallel to the display surface of the display panel 000, calculations are performed based on the area ratio of the gap layer in the first display area 011 A2 = 30% and the area ratio of the pixel definition layer 200 A3 = 50%.

[0081] Due to the high reflectivity of the anode 401, and the absorption and refraction of ambient light by the semi-transparent cathode 402 and the light-emitting layer 403, the reflectivity of ambient light is approximately 100%. Therefore, it is assumed that the transmittance of ambient light in the area where the light-emitting device 400 is located is T1=0; the gap layer is set to a high transmittance state with a transmittance of T2=90%.

[0082] In related technologies, without adding a dimming unit 300 and without using a high-transmittance electrode material for the source / drain layer 1028, considering both the pixel definition layer 200 and the underlying driving circuit layer 102, the transmittance T3 of the area where the pixel definition layer 200 is located is set to 50%. Thus, at the first display area 011, the transmittance T of the film layer below the light-emitting layer 403 (EL) is... e It can be calculated as follows:

[0083] For the transmittance of multi-layer materials, without considering interfacial reflectivity, the total transmittance can be calculated as the product of the transmittances of each individual layer. For the other layers in the display panel 000, the overall transmittance of the portion of these layers within the first display area 011 (the product of the transmittances of each individual layer) is denoted as T. b Therefore, the overall light transmittance T of the first display area 011 of the display panel 000 is... a It can be calculated as follows:

[0084] For a display device with an under-display photosensitive element, if the pixel density of the first display area 011 and the second display area 021 in the display panel 000 is equal, and the overall light transmittance of the first display area 011 is approximately 15%-20%, the embodiments of this application use the overall light transmittance T of the first display area 011 as an example. a The calculation is based on a baseline of 20%.

[0085] In this embodiment, a dimming unit 300 is provided in the first display area 011, and a pixel definition layer 200 covers the dimming unit 300. Considering that the pixel definition layer 200 is usually made of a high-transmittance material, and the thickness of the pixel definition layer 200 covering the dimming unit 300 is small, the transmittance T of the pixel definition layer 200 is assumed to be... p =95%. In the driving circuit layer 102, at least a portion of the electrode material located below the pixel definition layer 200 is silver nanowire material, with a transmittance T T =90%.

[0086] Thus, excluding the adjustable light-sensing unit 300, and ignoring surface reflections between materials, the combined light transmittance T4 of the pixel definition layer 200 and the electrode below it can be calculated as follows:

[0087] Furthermore, in conjunction with the dimming unit 300, when the ambient light intensity is less than or equal to 10 nits, the transmittance of the dimming unit 300 can be adjusted to 80%. Under this condition, the overall transmittance T of the area where the pixel definition layer 200 is located is... 3H It can be calculated as follows:

[0088] Thus, at the first display area 011, the light transmittance T of the film layer below the light-emitting layer 403 (EL) is... eH It can be calculated as follows:

[0089] The overall light transmittance T of the first display area 011 of the display panel 000 is... aH It can be calculated as follows:

[0090] Compared to a display panel 000 without a dimming unit 300, the overall light transmittance of the first display area 011 increases by approximately 18%. Experiments have shown that this increase is roughly equivalent to the effect achieved by reducing the pixel density of the first display area 011 by 40% in a display panel 000 without a dimming unit 300. Therefore, this embodiment can effectively improve the light transmittance of the first display area 011 in low-light environments while ensuring that the display quality of the first display area 011 is not significantly different from that of the second display area 021. Even in low ambient light conditions, it can ensure that photosensitive elements such as the under-display camera have sufficient light intake, guaranteeing excellent image quality.

[0091] When the ambient light intensity is greater than or equal to 1000 nits, the transmittance of the dimming unit 300 can be adjusted to 30%. Under this condition, the overall transmittance T of the area where the pixel definition layer 200 is located is... 3L It can be calculated as follows:

[0092] Thus, at the first display area 011, the light transmittance T of the film layer below the light-emitting layer 403 (EL) is... eL It can be calculated as follows:

[0093] The overall light transmittance T of the first display area 011 of the display panel 000 is... aL It can be calculated as follows:

[0094] Even in bright light conditions, under-display cameras and other light-sensing components can still receive sufficient light, even with low light transmittance.

[0095] At the same time, the reflectivity T of light is increased by the reflective structures such as the metal layer in the driving circuit layer 102. r1 The calculation is based on 80% as a baseline. In related technologies, the reflectivity T of ambient light after passing through the pixel definition layer 200 is... r2 It can be calculated as follows:

[0096] In this embodiment, in conjunction with the dimming unit 300, the reflectivity T of ambient light after passing through the pixel definition layer 200 is... r3 It can be calculated as follows:

[0097] Compared to a display panel 000 without a dimming unit 300, the reflectivity of ambient light is reduced by approximately 23%. Therefore, this embodiment can effectively reduce the reflectivity of the first display area 011, improve contrast, and enhance display performance when ambient light is bright.

[0098] In summary, the display panel provided in this application embodiment dynamically adjusts the transmittance of the dimming unit. The transmittance of the dimming unit is negatively correlated with the light intensity of the ambient light. Under the premise that the pixel density of the first display area and the second display area are equal or have a small difference, that is, the display quality of the first display area and the display quality of the second display area are not significantly different, the transmittance and reflectance of the first display area of ​​the display panel are optimized. This ensures that the display panel can guarantee that the under-screen photosensitive element has sufficient light intake and that the contrast ratio is high under different ambient light intensities, resulting in a better display effect of the display panel.

[0099] This application also provides a display device, such as... Figure 10 As shown, Figure 10 This is a partial structural schematic diagram of a display device provided in an embodiment of this application. The display device may include a photosensitive element 800 and a display module. The display module can be the aforementioned display module. The light-receiving surface of the photosensitive element 800 faces the first display area 011 of the display panel 000 in the display module. For example, the photosensitive element is located below the display panel 000, that is, the photosensitive element 800 is located on the side of the substrate 101 opposite to the driving circuit layer 102, and the orthographic projection of the photosensitive element 800 on the substrate 101 is located within the first display area 011. In this way, the photosensitive element 800 can receive ambient light transmitted through the first display area 011 to achieve a specific function.

[0100] The photosensitive element 800 can be one or more types. For example, the photosensitive element 800 can include at least one of an image sensor, a distance sensor, a structured light sensor, and a light intensity sensor. The number of each type of photosensitive element can be one or more, for example, two image detectors can be provided.

[0101] The drive component in the display module integrates a light transmission control circuit, which is electrically connected to multiple dimming units 300 distributed within the first display area 011. The display device may also include a light sensor. The display device is configured to: acquire the light intensity of ambient light through the light sensor, and based on the ambient light intensity, control the light transmittance of the multiple dimming units 300 through the light transmission control circuit.

[0102] Here, after the light sensor acquires the light intensity of the ambient light, it can transmit an electrical signal to the microcontroller in the light transmission control circuit. The microcontroller can then adjust the current within the light transmission control circuit based on this signal, thereby adjusting the light transmittance of the electrochromic part 303 in the dimming unit 300. The light transmittance of the dimming unit 300 is negatively correlated with the light intensity of the ambient light.

[0103] The display device can be any product or component with a display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator.

[0104] It should be noted that the dimensions of layers and regions may be exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be intermediate layers. Additionally, it is understood that when an element or layer is referred to as being "below" another element or layer, it can be directly below the other element, or there may be more than one intermediate layer or element. Furthermore, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Similar reference numerals throughout indicate similar elements.

[0105] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0106] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A display panel, characterized in that, The display panel includes a first display area and a second display area, wherein the second display area is at least partially distributed around the first display area; the display panel includes a driving backplane, a pixel definition layer, multiple dimming units, and multiple light-emitting devices; The plurality of dimming units are located on one side of the driving backplate, and at least some of the dimming units are distributed within the first display area; The pixel definition layer is located on the side of the plurality of dimming units away from the driving backplate. The pixel definition layer covers each of the dimming units and has a plurality of pixel openings. A portion of the plurality of pixel openings are located in the first display area, and another portion of the pixel openings are located in the second display area. The plurality of light-emitting devices correspond to the plurality of pixel openings, and the light-emitting devices are located within the corresponding pixel openings. The plurality of light-emitting devices are electrically connected to the driving backplate. The plurality of dimming units within the first display area are configured to adjust the light transmittance of the first display area.

2. The display panel according to claim 1, characterized in that, The dimming unit includes: a first electrode and a second electrode, and an electrochromic portion distributed between the first electrode and the second electrode; the first electrode and the second electrode are disposed opposite to each other in a direction parallel to the drive back plate; The electrochromic part is configured to adjust the light transmittance under the action of an electric field formed between the first electrode and the second electrode.

3. The display panel according to claim 2, characterized in that, The display panel further includes: a first connection line and a second connection line; the first connection line is electrically connected to the first electrode of each dimming unit, and the second connection line is electrically connected to the second electrode of each dimming unit. Both the first and second connecting lines are used for electrical connection with the light transmission control circuit.

4. The display panel according to claim 3, characterized in that, The dimming units are arranged in multiple columns along the first direction and in multiple rows along the second direction; The first connection line includes: multiple first signal connection lines and at least one second signal connection line; the first electrode of the dimming unit in the same row is electrically connected to the same first signal connection line, and the multiple first signal connection lines are all electrically connected to the light transmission control circuit through the at least one second signal connection line; The second connection line includes: multiple third signal connection lines and at least one fourth signal connection line; the second electrode of the dimming unit in the same row is electrically connected to the same third signal connection line, and the multiple third signal connection lines are all electrically connected to the light transmission control circuit through the at least one fourth signal connection line.

5. The display panel according to claim 2, characterized in that, The electrochromic part is elongated and, in the same dimming unit, one end of the electrochromic part is electrically connected to the first electrode in the length direction, and the other end is electrically connected to the second electrode.

6. The display panel according to any one of claims 2-5, characterized in that, The materials of the electrochromic part include: viologen compounds, polyaniline, tungsten trioxide, niobium oxide, or poly3,4-ethylenedioxythiophene.

7. The display panel according to any one of claims 1-5, characterized in that, The driving backplane includes: a substrate and a plurality of pixel driving circuits, wherein the plurality of pixel driving circuits are electrically connected to the plurality of light-emitting devices. In this configuration, all of the plurality of pixel driving circuits are located within the second display area; or, a portion of the plurality of pixel driving circuits are located within the second display area, while another portion is located within the first display area.

8. The display panel according to claim 7, characterized in that, The driving backplane includes a substrate and a driving circuit layer, the driving circuit layer including the plurality of pixel driving circuits; when a portion of the plurality of pixel driving circuits is located in the second display area and another portion of the pixel driving circuits is located in the first display area, at least the portion of the source-drain layer in the driving circuit layer located in the first display area is made of a transparent conductive material.

9. The display panel according to claim 8, characterized in that, The portion of the source-drain layer located within the first display area includes: a first type of signal line and a second type of signal line; The first type of signal line is completely covered by the pixel definition layer; or, the orthographic projection of the first type of signal line on the substrate includes a first region and a second region, the first region is located within the orthographic projection of the pixel definition layer on the substrate, the second region is located within the orthographic projection of the pixel opening on the substrate, and the area of ​​the first region is larger than the area of ​​the second region. The orthographic projection of the second type of signal line on the substrate includes a third region and a fourth region. The third region is located within the orthographic projection of the pixel definition layer on the substrate, and the fourth region is located within the orthographic projection of the pixel opening on the substrate. The area of ​​the third region is smaller than the area of ​​the fourth region. The first type of signal line is made of the transparent conductive material.

10. The display panel according to claim 9, characterized in that, The first type of signal line includes: a data signal line and a first bridging wire, wherein the first bridging wire is used to bridge the initial signal line in the driving circuit layer with the polysilicon layer in the driving circuit layer.

11. The display panel according to claim 8, characterized in that, The portion of the source / drain layer located in the first display area and the portion located in the second display area are made of the same material, both being made of the transparent conductive material.

12. The display panel according to any one of claims 8-11, characterized in that, The transparent conductive material includes: silver nanowires, indium tin oxide, or indium zinc oxide.

13. The display panel according to any one of claims 1-5 and 8-11, characterized in that, The orthographic projection of the dimming unit on the drive backplate does not overlap with the orthographic projection of the light-emitting device on the drive backplate. In a direction parallel to the drive backplate, the dimming unit and the light-emitting device are arranged alternately in the first display area.

14. A display module, characterized in that, include: A driving component, and a display panel electrically connected to the driving component, wherein the display panel is the display panel according to any one of claims 1-13.

15. A display device, characterized in that, include: A photosensitive element and the display module of claim 14; the light-receiving surface of the photosensitive element faces the first display area of ​​the display panel in the display module.

16. The display device according to claim 15, characterized in that, The drive component in the display module integrates a light transmission control circuit, which is electrically connected to multiple dimming units distributed in the first display area. The display device further includes a light sensor; the display device is configured to: acquire the light intensity of ambient light through the light sensor, and control the light transmittance of the plurality of dimming units based on the light intensity of the ambient light through the light transmittance control circuit; The light intensity of the ambient light is negatively correlated with the light transmittance of the dimming unit.

Images